Instrumentation
22
Frost
warning
Illuminates when ambient air
temperatures are between 0ºC
(32ºF) and 4ºC (39ºF). The yellow
sign warns of possible ice on the
roads.
Danger of ice warning
Illuminates when 0ºC (32ºF) and
below. The red sign warns of an
increased danger of icy roads.
The absence of a light in cold
temperatures does not necessarily
mean that there is no risk of ice on
the road. Caution should be
exercised when weather conditions
indicate that ice may be present.
Even if the air temperature rises to
above +4_C (39_F) it is no
guarantee that the road is free of
ice.
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